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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f2ce5b45710f9bc9f6f3b260fe1bebd99db17a783efd8662ce7316b5cba3dc' 
  AND token = 'B1P4LRmCFkvHjU9dtW+6p9zBSlWjF20DoWSHYUeGEZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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