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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e2eaabd9c2c3d7d685a179e44383e004950ab7d299f0612552414c7c2c9962' 
  AND token = 'F6Ddcp53SXgsGDL8YQsMRrTAnnxvmMdVumXg2RmAFiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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