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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11351018e264835dbc4f8516b45d20d2c9870abf52ab0ee709e32398a1a2b043' 
  AND token = 'ROUlPt1Fpy3w4fld1Nbkec3/Wqr87IVT7Z71kbZH4KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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