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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f87f73c01f6430b16fada0ba6d12b24839e17200f2d2885a13e355f02f14615' 
  AND token = 'Kw2K5TZIWv58xu02eFT20HZJRtFDPqJk/tpiCIoB+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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