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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12376d51ce2fdf1295d095a66b593cfbf21e00dce42e5915f2dfb92e0412ba9e' 
  AND token = 'AmjeoeqOoL8zEzkkdczO7NgiOrRph3tTpqzxPJ3vbiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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