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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8e94da012ca163d4c55969f19396d95ee5b761359aae147aeb6ff3cafa46a0' 
  AND token = 'N0AwR0nrTmUQ/T4k2k99Vjo4MZgLCtqg0LvFrCiXNl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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