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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af47c5c0bb4be7586286c4c21ea1bc0960d1a1a40bfab85e8d0a24978f9b541' 
  AND token = 'Pa0HpTPdqnc1JjXadS3fxMIG67sy2oNhXHw7DLWFFDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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