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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2dadbeb9855a153744970993e2fda9d617a3e2ccd2b98f3d356cde3cbfcab9' 
  AND token = '7NEYOJ9h37TlA/6R+K0EhaZvau016pYHDagwxC0KscA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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