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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbb6b1b8a502475c2c1c5aaa293454d7fcb8461ff4a9dd5ead8587eb3321bab' 
  AND token = '9+eL1e/1f/X1PIeuwOtiZlmGnC+so4rmGHVty6wwu8M=' 
  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"
    }
  }
}