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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c009774fa00a39eaf071081883b21db366d5665c1a59e763b4f508a55a70e08' 
  AND token = 'q8mVES9h3nFSHL+cEsZNMM9JGt4Q4U5HswMl3uua7Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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