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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be2a4d2ae6dc2a3ac4ecf02c1f4f6f2a973922d59d17e1d0d88b4f99b72b740' 
  AND token = 'gT/Jc958zxkJZc7voYVRLJY1z5CFBE+Y7e8J4axAhdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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