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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd04e179d2e7f41e98cc0064b917aec169a3f22f3017b90ff279ed76a63176e8' 
  AND token = 'x+MMcA4WD2BzDkeGmzkj3bMoesckT/TeRlVWch9KBtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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