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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804a3a9f4b3d6beeec52081dae131dc7c94737ac6ca458fe570fd04cad63e66b' 
  AND token = 'FL23svir30QMu4GV15gsjpH29hyhHChtYFQwxk3yKqM=' 
  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"
    }
  }
}