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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3cd454d9dc4e4b9a8a4b42f2e0a77e5066822555ed276897ea6625dd26c4301' 
  AND token = 'tVIRj9ZoO0YFOX8eKF8xWV/RxyjTCn0VWrwwTTk6x+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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