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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f2d3f13f89c3bb70edc5479423642e1f6179f319e9c2a45666bfe7dce416a4' 
  AND token = 'tD5fWauKxLPu8Jkp1KsU6i75bFiVbKTnIIaiNF0F4z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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