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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228a37653dda4f5069344260bb0a3b2662bcef0d1c8355a27b7d6d4dc9ad0d7f' 
  AND token = 'WuUn9Pb4F90s3U9xk+17Z50uD7NBb1w/6jFD19bOBW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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