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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46aa5253eb87d2b3c34713b651b14ff62d21359e20433f88c0fc9f5350ba9313' 
  AND token = '0/Le/0adR7nyHA28mYMsL+2Uo+xXP9uneCMHiP/Mffc=' 
  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"
    }
  }
}