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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91eff942841a30e3590d90b5e80866cd862993b807a112bb76f16f55a15cddd0' 
  AND token = 'm3fKHDABSrLmEFTWPVNtv6nlcjtaE8KpUhrsdktzKR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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