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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5e01f065fb74c52fa04b43ad533acbe4973e3b2ff7d26e96c6af874be75975' 
  AND token = 'HM48A9gW1KoZQvrqXBrCbk1cvG0ddoC9f/6L1X1129M=' 
  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"
    }
  }
}