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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaeac7c50837e8105a55a21675f039341cb509b6f0556fbfee9ea42ad3b0847' 
  AND token = '6ZpnYDHXFeCyfofTATw1E2Y+UZamf2YgfJXAXrF8oLk=' 
  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"
    }
  }
}