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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130ab83c23825053b6b7cc83e16de69066d4cb7382d6fde2a74e76b18e7f3953' 
  AND token = 'ZPoq3slbibjZC08ccSiZ24Z6aktAuCPR97FoRN5qU4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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