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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8140afabbe8868e89d1bc9e9e208a7e22f4ccab89b77efa56e1fe5eb8f9676' 
  AND token = 'ixhFcM26odCRmHZWsUefWRQeRD8c0N12An0/3X5M+N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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