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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfe8cc9aa0e54f954042c080200e0c944fde89f90de93e9fc45c541ebd6703f' 
  AND token = 'N5iscNO+dedIq1sVHl4qxJdv/x5rnLT0zWp/N1e0pXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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