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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d76a837b02c3086c9e9fa1c80268f77e82fbdcb7c31f936b40d59cdcf1ced1' 
  AND token = '/2PL+D43d8fzhcVYMbl3XHtUOSJeeeufqb05GQDP26c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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