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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ecb1fcb14de7e812a4c03a32eb2c6502f7127ea928ac7b94ab648a70ea6a51' 
  AND token = 'YT0ZAY04v2qkDk05nr/SxafXM2SfeKCUUqtiDEMaaZg=' 
  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"
    }
  }
}