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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0777a6e9823952ffc6f1114096235cf53787c5c3d07c2a40fd2bc64ba45f48ca' 
  AND token = 'EBenBXlpmRAUYN6nXk/0kNEtYYOKOthYxD+2mWTimE4=' 
  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"
    }
  }
}