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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7553b70e8508f60abc9bc635f28352f608b9db04fd939feb0eac5f6feb04015' 
  AND token = 'kyc5+7N2ovwO7Vp2pw8mb3qhUQAijpspX4faUFOJqRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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