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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198ef06271522a0dc8a7f77b1ce395d2a529ceb44d06a7aaebde768b9b4b93f8' 
  AND token = '7FuKZAsjBhvVa0LPbhdiZU6SZXMNfU1JqqZ8MK5V07c=' 
  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"
    }
  }
}