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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cec1e652b3b1d8df4c471b7435b01f07ad4fc7cf80df7f8a24ca48f6a2bd0f1' 
  AND token = 'zXEtGJhlC00li4l1mbqGObQ71TULaCHm7Z0+d4l03OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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