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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26db796515e5999dfd93fa0f4f07314f8ca6637da6cc16a2bfd8704239d9d3a9' 
  AND token = 'A6JtH08qcufrUwNmtAQ5qmCxRr6duRR7aQiev9xqrak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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