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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57c7d8e8345b9210a883e01afa2f19de4b0cddf53e29d7fd8f0f1d61e38068e' 
  AND token = 'YWgueN/GkJV/pae4jh0+oJbkX09rKoPY0Vl3MDIMmws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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