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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a6d553166810170de0e51a2265c1003e8a635996f8e36726b46809329e37af' 
  AND token = '7wwn6E+RqIVenrAmtn0y6b2aREYg0QMHGzjah7EZglE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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