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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1569048f30c30858dcfaaa9bcd7408c235755ed8f2e390679e7d02fc6c1dcca7' 
  AND token = '3hclmFSeOodZ2dS/OtYmGZd/HSBw34nJA519NS/aVo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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