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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa25b389a4b3bb17396bcf65105c08dbd3282d42caa760f90033f120aa49345' 
  AND token = 'hS9wTa8B5M8PyA3Kf5S2J/zHfVMZ5cFe5EG8EXi5NYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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