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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a279ad2f4f42e5dd46a2ad09c09676f734355928e7e7055b9d06dc02ea98639' 
  AND token = 'f1FvIj6wz30EUxdJbBZdjSORYgZfPNKc5+BHyK7rj0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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