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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f07eac2054663949c05c9d3780916b21d1b80eb914b766f3358a6bc9bd243d' 
  AND token = 'Jw/Y3A/8TSrZuDqm1Nyda9Er7W/4hHaa63wObFjrizg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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