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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39745410b3bdf1025b2d646358095c32fbf273094c113792d1b9a9c3b6b25aba' 
  AND token = 'qQf73nfMhV4qkJMdRvW9H930cICCFX60IvFP33aJCpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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