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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4138dca7b934dbb75a87207093b59860ccd42776eab12a24840f760c7c6cbd50' 
  AND token = 'eF19FcnZ1V2JJZKxaJHphM1YASPlGUSYBM1oE9a1tbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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