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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf26559bfee983923a23a80694ca1fb9f6a87e9d985275a3c596e932fd5c3992' 
  AND token = 'JgKts8T8zgk545b0y/23NmHkejfGUk0NXjESnyJDBwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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