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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb573a74cd8b2d772dbd72140af5131c05b7e5a670d19a954a2ad213824c9ce2' 
  AND token = '4rRRaubbzdO/HW0XfwIYQMxjgc6AsnwJ96GZrGH2O1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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