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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69c1990a38b5b41c869320a1ed6a246a016d40d2c433c5174151299aff6ce49' 
  AND token = 'q8BGR9noGkDRC3P+3zAUlGRnJFTMFu59wEy33G7xYGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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