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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f0aeea4d81a138af77e556b8b84658568a21c276f95973a7daabe92d3a5de1' 
  AND token = 'UIk0m7DSmDVr8ZWkwf+LJjsIPr1MbRHHWmLVUYpACnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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