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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7c82628689d6538559e91c7d2a324604f818adb8ebab0e23bdec5009a1ca16' 
  AND token = 'A+jakk0W7xjYnTgDqyIxKIv2UjMqAwliCemFZOM8ND4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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