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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab9a3cb39470c01cd29f0949d8e3969b34d022b08083e2502f7acb17db8c0c0' 
  AND token = 'HojI06oMLE3FknBN2LBqrxNy/dKTv19+026ABmdnVSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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