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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d973f1de6b27b6a973f0833d383da07beaa0f08a32e085006481cacc74f757' 
  AND token = 'Uhf5h9SvxyQjjEYRf3rPSKkQulqYf+fLKXnSrNcqTOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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