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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64533076f6af137d05b69aa6162a5fbf2e406e615cad70e3c2cb78900de32d86' 
  AND token = 'GtKtHj2nENd57FNgduM/iZ6vNjSuRRUYxIe7R4deGTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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