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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5eb8b89eec59bd6ea2c8d445c58050a8b56a4eec00ea6203053db33aa6a893' 
  AND token = '9VOB3w3hDyD9nD3HZl7iHIeVcg22e3Ikr/MLABMY4G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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