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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933284578f216c13eecc5a93f970ede254f041d7de284fa7f2fc5cdf8ec0f9af' 
  AND token = 'rzAB+X+1tS4I8TF6dfg6WBKJLWBcfuh+Y0F9D5gc9a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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