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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239f13d7a0a34cc6225961d9598872feef8e28e96b083d0e22e649d57c38be49' 
  AND token = 'Fk18whsaGbo8hXZhyputrCfFVVV1gJYUjRDM49ZRM5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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