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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc15e08c963fef8aed12bde2b7e89be5a27c9264a580ea7e9622de09a6f7527' 
  AND token = 'ElqUT9bbfhwt/b92p0VsKJFx7KsqT5U0MSuzMlE4c+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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