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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bcc53e7e67e6e2e7a8151d0c9e63f06689bc9720d8716d45d7d93c7a3d6588' 
  AND token = 'tMsCIwGt91qt2sF2hbgYw3jDbREU+w/WAG9Utd8Al7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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