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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bd11f1830fe64302f88b693fc076e49bc856d76f47d24dee9f839f07b3e09c' 
  AND token = 'S8kTv6sZTcpzu7Tf+AxEhD73160tmm9UGGlPW+iLZEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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