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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72835060e5210921ebc6c16ef967e6253487c7b7ebb8de02ac1467cb78504dd' 
  AND token = 'l+/UT9rNaXmguSKuwOVUL89dQbRE7Qa350TKKwgdYec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}