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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba4ca5258c9887272cb553992b0241a8010c0f4626d291faa031be2fc0604f4' 
  AND token = 'oupMpBVIX8RVFDW5ICTXOzbXaPkADQ6+w8Q6rLGKxF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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