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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564b3bb4b1314247a2ba9e6fd5a74033815c7fe1e80280a91fd078bfdd0c3700' 
  AND token = 'Nql7BfY+ceMnEZvoMrfgw5YMP6k89s+ThjN1qEYS02E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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