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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e199d2d06dc3ecdf4bdf3e87741e521618d890b93f78f0814404c691681ce5' 
  AND token = '3Drjke9e5+L0LkjYdyjmQYPAeOwum9tYAkRW5YQOvu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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