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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa69431b3e3f7cad9e503e997f6fe7b277e5e38a6a989229bf0cbbe022d852' 
  AND token = 'YK/cvCK1ojOx7yTJ4Sto/X6va7bijTavJGbaDApcWIY=' 
  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"
    }
  }
}