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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4855c2a544538f58e2bedb2b56db057d49e55e5daafd477d60be63c051488edb' 
  AND token = 'mULfM64/7MYQiBOd6qj+NPYTm/CU95rgwS1nDNtYOkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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