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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0448975ed841ba48afc737eecb0a654e698b017cb937d8c0d0cad27e57a6eb2' 
  AND token = 'Zj+Pid4EuelR/gnAkeQR6yuzM+eG+1Nma9PmPqBL8lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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